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[" 18.If "x^(6)-12x^(5)+ax^(4)+bx^(3)+cx...

[" 18.If "x^(6)-12x^(5)+ax^(4)+bx^(3)+cx^(2)+dx+64=0" has all positive roots then "],[[" (A) "a=60," (B) "b=-140," (C) "c=240," (D) "d=-192]]

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